Diagnostic RET controller



FIG. 1 is a perspective view of the diagnostic RET controller design;

FIG. 2 is a second perspective view of the diagnostic RET controller design;

FIG. 3 is a right side view of the diagnostic RET controller design;

FIG. 4 is a back side view of the diagnostic RET controller design;

FIG. 5 is a front view thereof;

FIG. 6 is left side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof; and,

FIG. 9 is a third perspective view of the diagnostic RET controller design, with a bottom flap in an open position.

The phantom line showing of environment is for illustrative purposes only. 

The ornamental design for a diagnostic RET controller, as shown and described. 